Valve insert



FIG. 1 is a front elevational view of a valve insert showing my newdesign;

FIG. 2 is a right side elevational view thereof, the left side being amirror image thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a top side perspective view thereof; and,

FIG. 6 is a bottom side perspective view thereof.

CLAIM The ornamental design for a valve insert, as shown and described.